Gearbox layouts
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In a manual transmission for a rear-wheel drive vehicle, the gear train is built up on three shafts: the input shaft, the countershaft, and the main shaft.
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Transaxle designs
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In transaxle designs, the drive is transferred through the clutch unit to a primary shaft. The primary shaft carries gears of different sizes which mesh with gears on a secondary shaft.
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Gearbox operation
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The speed ratio and the torque transferred depend on which gear is selected.
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Baulk-ring synchromesh unit
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A baulk ring synchromesh unit prevents gear engagement until the speeds of the rotating components are synchronized.
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Transaxle synchromesh unit
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In transaxle designs, the synchromesh unit is located between the end of each engagement sleeve and the gear. The engagement hubs and sleeves may be located on the primary or on the secondary shaft, depending on design.
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